Dreaamerkan ...I notice the same issues with Cache mode off and we have a fairly hefty internet connection. Does anyone know how much space with Caching turned on will use. If a user has 10GB of email will the Cache store 10GB on the local profile?

Dreaamerkan ...I notice the same issues with Cache mode off and we have a fairly hefty internet connection. Does anyone know how much space with Caching turned on will use. If a user has 10GB of email will the Cache store 10GB on the local profile?

I can't tell you for sure, but according to Exchange Online I'm using 279 MB, and my OST file is 636 MB. You'd have to take a large sampling to see if that is normal or not. If it is, then you'd be looking at a 25 GB OST for a 10GB mailbox.

The big thing at least is at least if the OST gets corrupted your mail is still there unlike if you archived and the PST got corrupted you're screwed. In my honest opinion a persons mailbox should never get that big. The only reason it does is because they are using their mailbox has their own file server. I run into this all the time at work. We only allow 700MB mailboxes and it drives people nuts.

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Hel, lo,

Well, Ofice365 is cool, no doubt, difference between cached and non-cached Outlook is, in cached mode you will have your mailbox items while you're off-line so you can continue work and in non-cached mode you need to be online and Outlook will not have your mailbox items locally in your computer, if your connection is good, your Outlook can be more quick and speedy as compare to cached-mode, attachments will download very quickly and all.

As far as mailbox size is concerned, your Office365 mailbox size comes with 25GB by default and Outlook 2010 work up to 50GB of mailbox size so it doesn't matter how big your mailbox is.

You can contact me at my email address if you need any help on Office365 platform, Just write 'Help - Office365' in subject to identify.

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Outlook is a really bad internet application. Online mode can't handle slow connections or drops decently... when downloading attachments it stalls. Really ugly programmed. What whould you think when your webmail hangs when it's downloading something. You wouldn't accept that. So why accept it from Outlook?... OST files are also a nightmare. Big and clumsy and search results can suffer too... And that new hybrid mode is not hybrid.. you can't scroll through all your messages. Instead you get a link 'look on the server for more...'. Really MS... make a good internet/connected mail application...